43240639049 has 2 divisors, whose sum is σ = 43240639050. Its totient is φ = 43240639048.

The previous prime is 43240639037. The next prime is 43240639093. The reversal of 43240639049 is 94093604234.

It is an a-pointer prime, because the next prime (43240639093) can be obtained adding 43240639049 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33408528400 + 9832110649 = 182780^2 + 99157^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43240639049 is a prime.

It is a super-3 number, since 3×43240639049³ (a number of 33 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (43240639249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21620319524 + 21620319525.

It is an arithmetic number, because the mean of its divisors is an integer number (21620319525).

Almost surely, 2^43240639049 is an apocalyptic number.

It is an amenable number.

43240639049 is a deficient number, since it is larger than the sum of its proper divisors (1).

43240639049 is an equidigital number, since it uses as much as digits as its factorization.

43240639049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 559872, while the sum is 44.

The spelling of 43240639049 in words is "forty-three billion, two hundred forty million, six hundred thirty-nine thousand, forty-nine".